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855581 is a prime number
BaseRepresentation
bin11010000111000011101
31121110122012
43100320131
5204334311
630201005
710162256
oct3207035
91543565
10855581
115348a1
12353165
1323c57c
14183b2d
1511d78b
hexd0e1d

855581 has 2 divisors, whose sum is σ = 855582. Its totient is φ = 855580.

The previous prime is 855527. The next prime is 855601. The reversal of 855581 is 185558.

855581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 749956 + 105625 = 866^2 + 325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-855581 is a prime.

It is a super-2 number, since 2×8555812 = 1464037695122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855511) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427790 + 427791.

It is an arithmetic number, because the mean of its divisors is an integer number (427791).

2855581 is an apocalyptic number.

It is an amenable number.

855581 is a deficient number, since it is larger than the sum of its proper divisors (1).

855581 is an equidigital number, since it uses as much as digits as its factorization.

855581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8000, while the sum is 32.

The square root of 855581 is about 924.9762159104. The cubic root of 855581 is about 94.9336933432.

The spelling of 855581 in words is "eight hundred fifty-five thousand, five hundred eighty-one".